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During Elizondo's tenure at AATIP, observers reported UFOs flying at hypersonic speeds — more than five times the speed of sound. Yet there were none of the signatures that usually accompany aircraft flying at such fantastic speeds, such as sonic booms, he said.

The UFOs were also unexpectedly mobile, traveling so fast that they would have experienced gravitational forces, or G-forces, that far exceed the limits of endurance for both humans and aircraft. The F-16 Fighting Falcon aircraft, one of the most maneuverable in the U.S.'s arsenal, reaches its limit at around 16 to 18 G's, while the human body can withstand about 9 G's "for a very short time" before a person would start to black out, Elizondo said.

"These things that we were observing were pulling 400 to 500 G's," he said. "They don't have engines or even wings, and they are able to seemingly defy the natural effects of Earth's gravitational pull."


400-500gs in instadeath